S-AWC (Super All Wheel Control)

DTC U0001: Bus Off

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

DTC SET CONDITIONS

The code is set when AWC-ECU ceases (bus-off).

PROBABLE CAUSES

- The CAN bus line is defective.
- Malfunction of AWC-ECU
- ECU malfunction of other system

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics

Using scan tool MB991958, diagnose the CAN bus lines.

Q. Is the check result normal?

YES Go to Step 2.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart.) After repairing the CAN bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.

Q. Is DTC No. U0001 set?

YES Replace the AWC-ECU.(Refer to Active Center Differential (ACD).) Then go to Step 3.
NO Intermittent malfunction. How to Cope With Intermittent Malfunctions.)
STEP 3. Check whether the DTC is reset.

Q. Is DTC No. U0001 set?

YES Return to Step 1.
NO This diagnosis is complete.